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ABC is an equillateral triangle and O is...

`ABC` is an equillateral triangle and O is'the clrcumcentre of the triangle. Triangle divides the circle into. three arcs. Length of one arc is `10 pi cm`
'(##VPU_HSS_MAT_IX_C09_E07_001_Q01##)'.a) -What is the perimieter of the circle?
b) What is the measure of `angle A O C ?`
c) Find the area of the shaded region?

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